5 papers
A multi-ion optical clock with uncertainty
Melina Filzinger, Martin R. Steinel, Jian Jiang +4
Today's most accurate clocks are based on laser spectroscopy of electronic transitions in single trapped ions and feature fractional frequency uncertainties below …
Continuous-wave laser source at the 148 nm nuclear transition of Th-229
Vishal Lal, Maksim V. Okhapkin, Johannes Tiedau +3
A continuous-wave laser source at 148.4 nm based on second-harmonic generation in randomly quasi-phase matched strontium tetraborate, SrB4O7, is demonstrated. It provides (1.3-0.6+…
The QTF-Backbone: Proposal for a Nationwide Optical Fibre Backbone in Germany for Quantum Technology and Time and Frequency Metrology
Klaus Blaum, Peter Kaufmann, Jochen Kronjäger +168
The recent breakthroughs in the distribution of quantum information and high-precision time and frequency (T&F) signals over long-haul optical fibre networks have transformative po…
Searching for dark matter with the Th-229 nuclear lineshape from laser spectroscopy
Elina Fuchs, Fiona Kirk, Eric Madge +5
The recent laser excitation of the low-lying Th-229 isomer transition is starting a revolution in ultralight dark matter searches. The enhanced sensitivity of this transition to th…
Laser spectroscopy on the hyperfine structure and isotope shift of sympathetically cooled Th ions
G. Zitzer, J. Tiedau, Ch. E. Düllmann +2
The hyperfine structure of Th ions in the nuclear ground state is investigated via laser spectroscopy of trapped Th ions that are sympathetically cooled by la…